In my opinion, the only worthwhile options are the Z1 shorties and the PPE headers. The FI long tube headers (LTHs) are not equal length and don't flow well. I initially had the Z1 shorties on my car, switched to FI LTH, and noticed a power loss. After switching to the PPEs, I regained the lost power.
Recently, I dyno-tuned a 2016 370Z Nismo at my shop. It achieved 35x whp with just ART pipes, a full Motordyne exhaust, and E85 tuning. The car had stock intakes with K&N filters. In my opinion, there's no reason to pursue more NA power beyond this point.
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Creator of the GTR TT Conversion Kit, NA Record Holder (401WHP)
Ecutek Master Tuner (VQ37, VR30, VR38, B58, S55, S58)
BTWTuning
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